Famty LEPORIDAL. 
The present revision of the American Leporide is based upon the 
material contained in the National Museum at Washington, supplemented by 
that of the Museum of Comparative Zodlogy at Cambridge. The speci- 
mens in the Museum of the Academy of Natural Sciences of Philadelphia 
and in the Museum of the Boston Society of Natural History have also 
been examined. The author has thus had access not only to the types of 
the species described by Prof. S. F. Baird, in his great work on the Mam- 
mals of North America, published in 1857, but also to nearly all the material 
used by him in his excellent elaboration of this family in the above-named 
work, together with the vast amount of material that has since accumulated 
at the Smithsonian Institution. This includes not only the collections made 
by the different Government expeditions since 1857, but also the large col- 
lections made since that date, under the auspices of the Smithsonian Institu- 
tion, in Alaska, the British Possessions, Mexico, and Central America. By 
far the larger portion of the specimens examined from localities within the 
United States received from any one source have been the collections made 
either by Dr. FE. V. Hayden personally or under his immediate direction, and 
especially during the prosecution of the geographical and geological survey 
of the Territories, now in progress, under the auspices of the Department of 
the Interior. Large collections have also been received from the other 
Government surveys of the Territories made under the direction of the 
Topographical Bureau. The most important collections from the region north 
of the United States were made by the late Mr. Robert Kennicott and by 
¢ . . yf . * 
Mr. William H. Dall, though very large additions have been received from 
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